Electric discharge tube



Get. a, 1940.

O. BAIER ELECTRIC DISCHARGE TUBE Filed Aug. 12, 1957 Patented Oct. 8, 1940 UNITED STATES EEGTRIC DISCHARGE TUBE Otto Baier, Berlin, Germany, asslgnor to 0. Lunch: Aktiengesellschaft, Berlin-Tempelho Germanmaeompany Application August 12, 1937, Serial No. 158,680 In Germany August 1'], 1936 2 Claims. (Ul- 49-81) The invention relates to electric discharge tubesoithe kindinwhichthevesselthereoiis composed of both metal parts and ceramic parts. In most cases a metal member forming part of 5 thevesselisarrangedatthesametimetoserve as one of the electrodes, such as the anode, for instance. An advantage of this arrangemmt is that the electrode so formed is well cooled.

The invention is concerned with the problem 10 of interconnecting the metal parts and ceramic parts of the' vessel by a seal or melt.

The simplest method would be to insert a metal partandaceramic partoneovertheoverand to seal their joint by applying a glass solder 16 thereto and heating this. have shown however that a vacuum tight sealing is not insured in this way.

Theinventionisinthenatm'eoianhnprovementuponthismethodandisdescrlbedhereso afterbywayofexample,referenceheinghadto theaccompanying drawinginwhich Fig.1isasectionalvle1roipartoiavessel oianelectrontuheandillustratesastepoithe noveimethod. Fig.2isatic 25 sectional viewof theiinishedtuhe.

The vessel shown byway 0! example comprises a cylindrical metal part I made of copper, for instance, and constituting the anode, and further comprlsesaceramicsleeveiandaceramiccover :03. Bleeveiisseatedina lotpartl. BodyLlandsleeveiaretastened toeachotherbyasealithatmaybeoigiass. i'orinstance. coverlandsleeveiareinterconnectedbyaseali. Ooverlcarriesanelectrodc as systemlwhichcomm'isesthccatbodeaadagrld.

In accordance with the invention body I, l and sleeve 2 are united with each other by a method such as follows.

Sleeve2isinsertedinpartltosuchextent only as represented in Fig. l by way of example. 5 The annular joint of the two is in a well known manner covered with a suitable sealing material 5, such asglass. While this material is still soft the sleeve 2 is moved farther or entirely into the extension Hereby so much of the sealing 1 material 5 is caused to enter the space between the parts 2, I that the edge portion of the extension 1, already coated outside with sealing material, is now coated also inside therewith,

a perfect sealing being obtained in this way. In 1 order clearly to illustrate this result, the space betweenthepartstlisinthedrawirigassumed tobelargerthanitisormustbeinreality.

What is claimed is:

1. The method 0! manufacturing discharge 90 vessels having metallic and ceramic wall portions comprising the following steps; assembling said 'ons so that they meet in a joint, placing a moltenseal on the outside of the joint, and moving one portion past the other to force the 25 seal into the joint.

2. The method of manufacturing discharge vessels having metallic and ceramic wall portions comprising the following steps; placing one of said portions within the other to form an overso lapping telescopin joint, applying a molten seal to the joint, and further telescoping said portions to force the seal between the overlapping parts within the joint.

OTTO BAIER I 

